[Mellanox] set default IMA algorithm to sha384 on SN4280 (sonic-net#1…

…9973)

- Why I did it
To avoid the following error message:
ima: No suitable TPM algorithm for boot aggregate

- How I did it
Set the IMA hash algorithm to sha384 so the IMA can find the TPM algorithm

- How to verify it
Manual test

Signed-off-by: Yakiv Huryk <yhuryk@nvidia.com>

device/mellanox/x86_64-nvidia_sn4280-r0/installer.conf

@@ -1 +1 @@
-ONIE_PLATFORM_EXTRA_CMDLINE_LINUX="libata.force=noncq module_blacklist=mlx5_ib,mlx5_core"
+ONIE_PLATFORM_EXTRA_CMDLINE_LINUX="libata.force=noncq module_blacklist=mlx5_ib,mlx5_core ima_hash=sha384"